YANGGeng,ZHANGGui-quan,SUZhi,et al.Effect and Parameters Optimization of Subcritical Hydrothermal Method for Treatment of Municipal Sludge[J].China Water & Wastewater,2022,38(23):95-99.
亚临界水热法处理市政污泥的效果及参数优化
- Title:
- Effect and Parameters Optimization of Subcritical Hydrothermal Method for Treatment of Municipal Sludge
- Keywords:
- subcritical hydrothermal reaction; municipal sludge; COD; ammonia nitrogen; hydropyrolysis
- 摘要:
- 采用亚临界水热法对某市政污泥进行水热解+水氧化两步处理，考察其处理效果，并基于实际工程操作考虑对工艺参数进行优化。结果表明，在250 ℃、5 MPa条件下对含水率为90%的市政污泥进行水热解1 h后，污泥离出液的SCOD浓度达到33 780 mg/L，维持反应条件不变，控制氧化系数在1.5继续水氧化1 h，污泥离出液的COD去除率达到91.62%，氨氮浓度为212 mg/L，重金属浸出毒性满足国家标准。由此确定，以上工艺参数是较为合理的，污泥经处理后液相部分可送至城镇污水厂处理后达标排放，固相部分可直接进行资源化利用或无害化填埋。
- Abstract:
- The performance of subcritical hydrothermal technology (including two steps of hydropyrolysis and oxidation) for treating municipal sludge was investigated, and the process parameters were optimized based on actual engineering operation. The municipal sludge with moisture content of 90% was pyrolyzed at 250 ℃ and 5 MPa for 1 h. After the treatment, the SCOD in sludge centrifugal effluent was 33 780 mg/L. Under the same reaction conditions, when the oxidation coefficient was controlled at 1.5 for 1 h, the COD removal rate of the sludge centrifugal effluent reached 91.62%, the ammonia nitrogen concentration was 212 mg/L, and the leaching toxicity of heavy metals met the national standards. The results indicated that the above process parameters were reasonable. After the treatment, the liquid part of the sludge could be sent to the municipal wastewater treatment plant for treatment and discharge after meeting the discharge standard, and the solid part could be directly utilized as resources or disposed by sanitary landfill.
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